← OpenAI
Creator Magic
My AI Agent Is Buying Itself Mac Minis on eBay
⏱ 10 min video · 3 min read24 Jun 2026Worth watching
TL;DR
The creator builds an autonomous AI agent called Silicon Seeker using OpenClaw, GStack, and the Zapier SDK that searches eBay for second-hand Mac minis, scores listings, records results in Google Sheets, and sends the best deals to Slack. The project was prompted by WWDC 2025 delivering no new Mac mini or Mac Studio hardware, making second-hand the only option for more compute right now.
Key points
1
The stack uses three open source tools: OpenClaw as the agent runtime, GStack (a Claude Code framework created by Y Combinator CEO Garry Tan) as the skill layer, and the Zapier SDK as the action layer connecting to eBay, Slack, and Google Sheets.
2
WWDC delivered no new Mac mini or Mac Studio hardware, making second-hand eBay shopping the only current route to more Apple silicon compute.
3
GStack's office hours feature acts like a Y Combinator partner, challenging the build plan before any code is written and researching live API endpoints to confirm what is actually possible on eBay.
4
The agent searches eBay listings, scores them, writes results with price, postage, seller feedback, and watcher counts to a Google Sheet, and sends the best deal as a Slack DM with a direct purchase link.
5
The full project has been packaged as an open source skill so anyone can clone the repo and have their agent hunting eBay for Mac minis, GPUs, cameras, or other hardware within minutes.
Actionable insights
→
Use GStack's office hours slash command before writing any code to validate what eBay API endpoints actually exist and avoid building against unavailable functionality like bidding or Buy It Now direct purchase.
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The Zapier SDK (not the browser-based no-code Zapier) is the right tool when you need buyer-side eBay functionality that the native Zapier eBay app does not cover, since that app is seller-focused.
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Connect your eBay account to Zapier once via OAuth, then let the Zapier SDK handle all authenticated requests autonomously from inside your agent without manual API key management.
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GStack can hand off to a second independent AI (Codex or Gemini) for a review before committing to a build plan, adding a useful sanity check layer to agentic development.
Notable quotes
“My OpenClaw agent just decided it needs more compute. It keeps thinking things like this. So I gave it a budget. Let it shop for itself.”
“WWDC was a damp squib. No new Mac minis, no new Mac studios, no new hardware at all. Which means if you want more compute right now, you are shopping second hand.”
“OpenClaw can literally recruit its own hardware.”
Worth watching?
✅
Worth watching the full video?
Worth watching if you want to see the live build walkthrough and the actual agent output in Google Sheets and Slack, but the key steps, tools, and gotchas are all covered here.
Saved you some time? The creator still deserves a like.
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